Quality Latching Relay Products at Great Prices - Cost Effective Power Switching Solution



A Wide range of latching relay products from Industrial Spacetek (ISTEK) are available for customers to choose. These bistable relays have been designed and manufactured to meet different power management requirements. They have very high performances on functions like connect and disconnect of power supplies; tariff and prepayment of energy meters.

Depending on the operational ambient conditions and the load of the controlled circuit, clients can select the most suitable latching relays from our broad range of products.


Top quality latching relay products at low price for cost effective power management


While most of our bistable relay products are single phase latching relays, we also have multi-pole relays including three phase latching power relay products.

Customised relay assemblies with copper wires, brass terminals, CTs and shunts are also available when required.

Customised Latching Relay CT and Brass Terminal AssembliesCustomised Latching Relay CT and Brass Terminal Assemblies

Majority of our magnetic latching relays can come with either one or two coils. The rated coil voltage spans from 5vdc to 48vdc including the most popular choices of 12vdc and 24vdc.

In general, our bistable relays are divided into three categories based on their switching power and contact capacity.

  • High switching power and high contact capacity relays - including switching ratings 100A, 120A and 150A at 277Vac  (UC3 compliant)
  • Medium contact capacity relays - including switching ratings of 30A, 60A, 80A and 90A at 250Vac
  • Miniature power latching relay - including switching ratings of 2A 125Vac, 5A 250Vac and 10A 250Vac




High switching power and high contact capacity latching relays



100A Latching Relays (HTLW Aerospace Longway series):

1). HTLW-R103-100A 250Vac

  • Maximum Switching Current: 100A
  • Contact Resistance at Rated Current: 0.5mΩ Max.
  • Contact Form: 1B
  • Insulation Resistance: 1,000MΩ Min. (500Vdc)
  • Dielectric Strength: between contacts - 1,500Vac (50/60Hz 1min); between contact and coil - 4,000Vac (50/60Hz 1min).
  • Endurance life: Mechanical - 1,000,000; Electrical - 10,000
  • Ambient Temperature: -40 - +70
  • Dimensions: 38 x 31 x 17
  • Coil voltage: 5Vdc, 6Vdc, 9Vdc, 12Vdc, 24Vdc and 48Vdc
  • Features and Applications: smart metering (energy meter), electrical remote control, energy compound switch (SCR combined switch), energy leakage protection etc...

Low energy consumption, long life power relay

HTLW-R103-100A: Low energy consumption, long life power relay. Contact us to find out the best price.  For more technical details of this magnetic bistable relay, please download its product datasheet: Latching-Relay-HTLW-R103-100A-250Vac

2). HTLW-R104-100A 250Vac

  • Maximum Switching Current: 100A
  • Contact Resistance at Rated Current: 0.5mΩ Max.
  • Contact Form: 1A, 1B
  • Insulation Resistance: 1,000MΩ Min. (500Vdc)
  • Dielectric Strength: between contacts - 2,000Vac (50/60Hz 1min); between contact and coil - 4,000Vac (50/60Hz 1min).
  • Endurance life: Mechanical - 1,000,000 OPS; Electrical - 10,000 OPS
  • Ambient Temperature: -40 - +70
  • Dimensions: 37 x 35 x 18
  • Coil voltage: 5Vdc, 6Vdc, 9Vdc, 12Vdc, 24Vdc and 48Vdc
  • Applications: smart metering (power meter), electrical remote control, energy compound switch (SCR combined switch), energy leakage protection etc..

High reliability, low temperature rise latching relay

HTLW-R104-100A: High reliability, low temperature rise keeping relay. Contact us to find out the best price. For more technical details of this power relay, download its datasheet: Latching-Relay-HTLW-R104-100A-250Vac

3). HTLW-R107-100A 277Vac

  • Maximum Switching Current: 100A
  • Contact Resistance at Rated Current: 0.5mΩ Max.
  • Contact Form: 1A, 1B
  • Insulation Resistance: 1,000MΩ Min. (500Vdc)
  • Dielectric Strength: between contacts - 2,000Vac (50/60Hz 1min); between contact and coil - 4,000Vac (50/60Hz 1min)
  • Operation Endurance (at 277Vac): Mechanical - 1,000,000 OPS; Electrical - 10,000 OPS
  • Ambient Temperature: -40℃ - +70
  • Dimensions: 53 x 44 x 22
  • Coil voltage: 5Vdc, 6Vdc, 9Vdc, 12Vdc, 24Vdc and 48Vdc
  • Features: UC3 certified at 277Vac - withstands short circuit current 7000A; great anti-tampering performance (DC magnetic field up to 400mT); very low temperature rise (less than 20K under continuous load for 2 hours)
  • Applications: smart metering (power meter), electrical remote control, energy compound switch (SCR combined switch), energy leakage protection etc...

The most reliable latching relay for energy meter

HTLW-R107-100A: most reliable UC3 compliant bistable relay for energy meter. Contact us to find out the best price. For more technical details, please download its datasheet: Latching-Relay-HTLW-R107-100A-277Vac

4). HTLW-R108-100A 250Vac

  • Maximum Switching Current: 100A
  • Contact Resistance: 0.8mΩ Max.
  • Contact Form: 1A (bridge contact form with superior arc-elimination ability)
  • Insulation Resistance: 1,000MΩ Min. (500Vdc)
  • Dielectric Strength: between contacts - 3,000Vac (50/60Hz 1min); between contact and coil - 4,000Vac (50/60Hz 1min)
  • Operation Endurance: Mechanical - 1,000,000 OPS; Electrical - 20,000 OPS (and 40,000 OPS for the enhanced version)
  • Ambient Temperature: -40- +70
  • Dimensions: 51 x 38 x 20
  • Coil voltage: 5Vdc, 6Vdc, 9Vdc, 12Vdc, 18Vdc, 24Vdc and 48Vdc
  • Response time: Pick-up <5ms@18Vdc; Releasing time <5ms@18Vdc; Bounce Time <0.8ms@18Vdc
  • Applications: Very fast latching relay can be used for smart metering (power meter), electrical remote control, intelligent capacitor bank, energy compound switch (SCR combined switch), energy leakage protection etc...

Very Fast Switching  Latching Relay with Contactor Switching Performance

HTLW-R108-100A: very fast bistable relay, designed for capacitive loads with contactor like performance. Contact us to find out the great price. For more technical details of this superior power relay, please refer to its product datasheet:  Latching-Relay-HTLW-R108-100A-250Vac

5). HTLW-R111-100A 250Vac

  • Maximum Switching Current: 100A
  • Contact Resistance: 1mΩ Max.
  • Contact Form: 1A, 1B
  • Insulation Resistance: 1,000MΩ Min. (500Vdc)
  • Dielectric Strength: between contacts - 2,000Vac (50/60Hz 1min); between contact and coil - 4,000Vac (50/60Hz 1min)
  • Operation Endurance: Mechanical - 1,000,000 OPS; Electrical - 10,000 OPS
  • Ambient Temperature: -40- +70
  • Dimensions: 52 x 35 x 20
  • Features and Applications: great performance on anti-tampering and anti magnetic filed (400mT) for smart metering (power meter), electrical remote control, energy compound switch (SCR combined switch), energy leakage protection etc...



Smart meter Anti-tampering relay with internal magnetic protection shield - operating in 400mt strong magnetic field!

HTLW-R111-100A: very compact size with internal magnetic protection shield, this uniquely designed latching relay stands out in the market for its superior anti-magnetic-tampering performance. Contact us for more details or trial samples.


120A Latching Relays (HTLW Aerospace Longway series):

1). HTLW-R107-120A (UC3 certified @ 277Vac )

  • Maximum Switching Current: 120A
  • Contact Resistance at Rated Current: 0.4mΩ Max.
  • Contact Form: 1A, 1B
  • Insulation Resistance: 1,000MΩ Min. (500Vdc)
  • Dielectric Strength: between contacts - 2,000Vac (50/60Hz 1min); between contact and coil - 4,000Vac (50/60Hz 1min)
  • Operation Endurance (at 277Vac): Mechanical - 1,000,000 OPS; Electrical - 10,000 OPS
  • Ambient Temperature: -40 - +70
  • Dimensions: 53 x 44 x 22
  • Coil voltage: 5Vdc, 6Vdc, 9Vdc, 12Vdc, 24Vdc and 48Vdc
  • Features: UC3 certified at 277Vac - withstands short circuit current 7000A; option for great anti-tampering performance (DC magnetic field up to 400mT); very low temperature rise (less than 20K under continuous load for 2 hours)
  • Applications: smart metering (power meter), electrical remote control, energy compound switch (SCR combined switch), energy leakage protection etc...

ISTEK-HTLW-R107-120A Latching Relay and CT Assembly for Energy MetersISTEK-HTLW-R107-120A Latching Relay and CT Assembly for Electric Meter

Contact us to find out the competitive price and other customization options for this outstanding relay.

2). HTLW-R108-120A 250Vac

  • Maximum Switching Current: 120A
  • Contact Resistance: 0.8mΩ Max.
  • Contact Form: 1A (bridge contact form with superior arc-elimination ability)
  • Insulation Resistance: 1,000MΩ Min. (500Vdc)
  • Dielectric Strength: between contacts - 3,000Vac (50/60Hz 1min); between contact and coil - 4,000Vac (50/60Hz 1min)
  • Operation Endurance: Mechanical - 1,000,000 OPS; Electrical - 10,000 OPS (40,000 OPS for the enhanced version)
  • Ambient Temperature: -40 - +70
  • Dimensions: 51 x 38 x 20
  • Coil voltage: 5Vdc, 6Vdc, 9Vdc, 12Vdc, 18Vdc, 24Vdc and 48Vdc
  • Response time: Pick-up <5ms@18Vdc; Releasing time <5ms@18Vdc; Bounce Time <0.8ms@18Vdc
  • Applications: Very fast latching relay can be used for smart metering (power meter), electrical remote control, intelligent capacitor bank, energy compound switch (SCR combined switch), energy leakage protection etc...

Contact us to find out the best price or more technical details of this relay.



150A High Power High Performance Model:

HTLW-R107-150A 250Vac 

  • Maximum Switching Current: 150A
  • Contact Resistance at Rated Current: 0.3mΩ Max.
  • Contact Form: 1A, 1B
  • Insulation Resistance: 1,000MΩ Min. (500Vdc)
  • Dielectric Strength: between contacts - 2,000Vac (50/60Hz 1min); between contact and coil - 4,000Vac (50/60Hz 1min)
  • Operation Endurance (at 277Vac): Mechanical - 1,000,000 OPS; Electrical - 10,000 OPS
  • Ambient Temperature: -40 - +70
  • Dimensions: 53 x 44 x 24
  • Coil voltage: 5Vdc, 6Vdc, 9Vdc, 12Vdc, 24Vdc and 48Vdc
  • Features: very high switch power (150A / 250Vac); option for great anti-tampering performance (DC magnetic field up to 400mT); very low temperature rise (less than 20K under continuous load for 2 hours)
  • Applications: smart metering (power meter), electrical remote control, energy compound switch (SCR combined switch), energy leakage protection etc...

Contact us to find out the lowest price from us or more technical details for this high contact rating relay.




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